I wanted to install secondary hard drive so I mounted the hard drive in the computer and I connected the power cable and the data cable. I powered up the computer and chose the master hard drive in the boot menu (the secondary drive appeared as well). The OS (windows 10 pro) was started but the OS didn't show the secondary hard drive.
How can I install the secondary hard drive corrently?
Edit: The hard drive doesn't appeared on the "disc management" tool but it does appear on the BIOS menu.
I am very sorry about my computer languege. you have to belive me that this is the disk management tool.....
